Jesus heals the mother-in-law of Apostle Peter.
From the Wikipedia: The Synoptics describe Jesus as healing the mother-in-law of Simon Peter when he visited Simon's house in Capernaum, around the time of Jesus recruiting Simon as an Apostle (Mark has it just after the calling of Simon, while Luke has it just before).
And: The synoptic gospels (from Greek, συν, syn, together, and όψις, opsis, seeing) are the first three gospels—Matthew, Mark, and Luke—found in the New Testament of the Bible. These gospels often recount the same stories about Jesus, generally follow the same sequence and use similar wording. The hows and whys of these books' similarities and differences to each other and to other gospels is known as the synoptic problem. The synoptic gospels are contrasted with the fourth gospel, John.